umputun / stash / 20630896431

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feat(api): return 201 Created for new keys, 200 OK for updates

- store.Set now returns (created bool, err) to distinguish create vs update
- api handler returns 201 Created when key is new, 200 OK when existing
- audit trail distinguishes create vs update actions based on response
- token masking in audit logs now uses 4 chars (matching auth.go)
- added composite index idx_audit_ts_key for better query performance
- updated Go, Python SDKs to accept 201 status code

related #51

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